ARM juno R2 board USB Issue (EHCI probe failed)

[Sajjan, Vikas C]

Hi All,

-----Original Message-----
From: Robin Murphy [mailto:robin.murphy at arm.com] 
Sent: Tuesday, September 27, 2016 9:53 PM
To: Hanjun Guo <hanjun.guo at linaro.org>; Sudeep Holla <sudeep.holla at arm.com>; Sajjan, Vikas C <vikas.cha.sajjan at hpe.com>; Vikas Sajjan <sajjan.linux at gmail.com>; linux-usb at vger.kernel.org; linux-arm-kernel at lists.infradead.org; linux-acpi at vger.kernel.org
Cc: mark.rutland at arm.com; lorenzo.pieralisi at arm.com
Subject: Re: ARM juno R2 board USB Issue (EHCI probe failed)

On 27/09/16 17:13, Hanjun Guo wrote:
> On 09/27/2016 05:07 PM, Sudeep Holla wrote:
>>
>>
>> On 27/09/16 09:55, Sajjan, Vikas C wrote:
>>> Hi Sudeep,
>>>
>>> -----Original Message-----
>>> From: Sudeep Holla [mailto:sudeep.holla at arm.com]
>>> Sent: Tuesday, September 27, 2016 2:21 PM
>>> To: Vikas Sajjan <sajjan.linux at gmail.com>; 
>>> linux-usb at vger.kernel.org; linux-arm-kernel at lists.infradead.org; 
>>> linux-acpi at vger.kernel.org
>>> Cc: Sudeep Holla <sudeep.holla at arm.com>; mark.rutland at arm.com; 
>>> lorenzo.pieralisi at arm.com; Sajjan, Vikas C 
>>> <vikas.cha.sajjan at hpe.com>
>>> Subject: Re: ARM juno R2 board USB Issue (EHCI probe failed)
>>>
>>> Hi Vikas,
>>>
>>> On 27/09/16 09:14, Vikas Sajjan wrote:
>>>> Adding USB mailing list.
>>>>
>>>>
>>>> On Tue, Sep 27, 2016 at 12:33 PM, Sajjan, Vikas C 
>>>> <vikas.cha.sajjan at hpe.com> wrote:
>>>>> Hi All,
>>>>>
>>>>> I working on ARM juno R2 board, with latest kernel 4.8.rc7 and I 
>>>>> get below USB EHCI probe error while booting with acpi=force.
>>>>>
>>>
>>> Are you using the latest UEFI EDK2 ?
>>> No, I am still using the UEFI binary which came as part of the Juno 
>>> board.
>>>
>>>
>>>>> [    1.223662] VFIO - User Level meta-driver version: 0.3
>>>>> [    1.229335] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI)
>>>>> Driver
>>>>> [    1.235882] ehci-pci: EHCI PCI platform driver
>>>>> [    1.240359] ehci-platform: EHCI generic platform driver
>>>>> [    1.245619] ehci-platform ARMH0D20:00: Error: DMA mask
>>>>> configuration failed
>>>>> [    1.272491] ehci-platform: probe of ARMH0D20:00 failed with
>>>>> error -5
>>>>> [    1.278876] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
>>>>> [    1.285071] ohci-pci: OHCI PCI platform driver
>>>>> [    1.289548] ohci-platform: OHCI generic platform driver
>>>>> [    1.294884] usbcore: registered new interface driver usb-storage
>>>>> [    1.301231] mousedev: PS/2 mouse device common for all mice
>>>>> [    1.307197] rtc-efi rtc-efi: rtc core: registered rtc-efi as rtc0
>>>>>
>>>>> But this error goes off, if I don't force ACPI booting, i.e., if I 
>>>>> remove acpi=force from kernel command line , USB is detected  and 
>>>>> my RFS which is in the usb drive, gets mounted successfully.
>>>>>
>>>
>>> As I mentioned in private, I do get the same error if I drop _CCA in 
>>> USB object of ACPI DSDT. Can you give it a spin with latest UEFI ?
>>>
>>> Sure, will try with latest UEFI.
>>>
>>
>> I bet that's 8-12 months old. It puts the banner during boot with the 
>> build date. You can try to follow [1] or access it from [2]
> 
> Agree.
> 
> D03 is using the same IP (EHCI) and the USB works fine with _CCA in 
> the device node.

_CCA is mandatory on arm64 (see CONFIG_ACPI_CCA_REQUIRED). Any devices without it are going to end up with the dummy DMA ops which intentionally fail if a driver tries to use them - i.e. the error seen above is by design.

Thank you for the clarification.

Thanks and Regards
Vikas Sajjan

Robin.

> 
> Thanks
> Hanjun
> 
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